QSG Chinese 3 phase Dry Type Auto transformer 440v to 220v

What Is a Three-Phase Dry-Type Autotransformer?

A three-phase autotransformer uses a shared winding structure, where the primary and secondary voltages are derived from the same coil. This design reduces copper usage, improves efficiency, and lowers cost—making it ideal for applications that require voltage conversion without full electrical isolation.

Compared with isolated transformers, an autotransformer offers:

• Higher efficiency due to reduced copper loss

• Smaller footprint

• Lower overall cost

• Improved voltage regulation

This makes the QSG Series a preferred solution for converting 440V to 220V, 660V to 380V, or multi-voltage distribution systems in manufacturing and commercial facilities.

Technical Parameters

Key Features & Advantages

✔ High Efficiency Dry-Type Construction

The dry air-cooled structure eliminates oil leakage risks and is safer for indoor environments such as workshops, control rooms, and machinery equipment cabinets.

✔ Precision Voltage Conversion

• Voltage accuracy: ±1%

• Voltage variation rate: ≤1.5%

• No additional waveform distortion

Ensures that sensitive equipment receives stable and clean three-phase power.

✔ Wide Customizable Voltage Options

Input options: 380V / 440V / 660V / 220V (or custom)
Output options: 220V / 380V / 400V / 415V / 440V / 690V / 110V / 1140V (customizable)

✔ Excellent Efficiency

Transformer efficiency can reach ≥99%, significantly reducing long-term energy cost.

✔ Rugged Industrial Design

• Class F insulation

• Temperature tolerance: -10°C to +40°C

• Air-cooled, maintenance-friendly

• Customizable D/Y or Y/Y connections

✔ Reliable Chinese Transformer Manufacturing

Each QSG autotransformer is manufactured following strict standards and undergoes dielectric strength testing at 1500V/1 min, ensuring durability and safe operation.

ZHENGXI’s engineering team supports OEM/ODM projects and provides voltage configuration guidance for international customers.

Where Are 440V-to-220V Three-Phase Autotransformers Used?

Industrial Applications

• CNC machinery

• PLC control cabinets

• Industrial motors and pumps

• Automation equipment

• HVAC and compressors

Commercial Applications

• Distribution panels

• Elevator control systems

• Workshops and small factories

Renewable & Energy Systems

• Wind turbines

• Solar inverter integration

• Distributed energy storage

The QSG series is especially popular in Southeast Asia, South America, Africa, and Middle Eastern regions due to its reliability and competitive pricing.

Why Choose ZHENGXI?

• Top Chinese transformer manufacturer with global distribution

• Fast production, strong R&D, and OEM customization

• Competitive 3 phase transformer price vs. international brands

• Over 10,000+ units exported worldwide yearly

• CE, ISO, and strict factory inspection reports

Whether you’re replacing an older transformer or designing a new power distribution system, ZHENGXI provides both standard and customized solutions.

How to Choose the Right 440V→220V Autotransformer

1. Determine the rated load (kVA).
Add equipment wattage + 20% safety margin.

2. Confirm input & output voltage.
Tell us your exact grid voltage (e.g., 440V ±10%).

3. Select connection method.
D/Y or Y/Y depends on system grounding.

4. Check cooling & installation environment.
Dry-type units are ideal for indoor use or dust-free rooms.

If unsure, our engineers will recommend the correct model in minutes.

FAQ

Q1: Is a dry-type autotransformer safe for indoor use?

Yes. It uses an air-cooled, non-oil structure—safe for factories, warehouses, and commercial buildings without risk of oil leakage or fire hazards.

Q2: What is the typical price of a 3-phase transformer 440V to 220V?

The transformer 440V to 220V price depends on capacity (kVA), voltage, and connection method. Contact us for a fast quotation.

Q3: Can you customize the voltage for special equipment?

Absolutely. We can produce any voltage combination such as 660→380V, 440→415V, or 400→220V.